In a hostile environment case $($predicated on an employee's protected characteristic$),$ if a supervisor has taken a tangible employment action against an employee, what defense is available to the employer?

Group of answer choices

That it exercised reasonable care to prevent and correct promptly any harassing behavior

That the plaintiff employee unreasonably failed to take advantage of any preventive or corrective opportunities provided by the employer or to avoid harm otherwise

both a and b

No defense is available$--$liability is automatic.